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Thanks Alex

it has stuff stamped on the sides of the sensor like 3a0 919 563, max 150 c, 805/40/1, tried to google it but cant find anything. driving me nuts. it must be something to do with the oil tho because it is threaded into the oil channel for the tappets

its actualy on the side of the cylinder head and i cant add any images, just keeps coming up with this [url][img][img][/img][/img][/url]

no sorry its the one on the side of the engine not the top. wont let me upload image but here is a url

just took apart my head to have it skimmed and broke the BLACK SENSOR on the right side of the cylinder head. does anyone know what this is ? there is a green one on the front of the block on the same side which i think is the oil pressure sensor. they both screw directly into the head.

any help ...